If your site is not up, could you check whether the app pool in your IIS is started?
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Deepu NairFeb 9 '12 at 4:47

Have you followed Harbar's documentation on setting up User Profiles Services App? harbar.net/articles/sp2010ups.aspx Also, Microsoft has updated the Technet documentation on setting up user profile services : technet.microsoft.com/en-us/library/ee721049.aspx As per poster above, If your Web application isn't coming up, there's propably an issue with the app pool. Most likely it's stopped. An App pool which is stopped would also be the only reason why an issue isn't logged in ULS.
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FoxFeb 9 '12 at 6:26

1 Answer
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I can't see how the User Profile Service App would have effected the primary web application. Ensure that your service account running the application pool has been granted rights to log on as a service and log on as batch service. Ensure the App Pool is started.

If by chance you installed SharePoint 2010 w SP1 then you will need to look to apply the December 2011 CUs to fix the UPS correlation error I've found the combined media has a bug with the UPS.